iOS 9 is the ninth major release of the iOS mobile operating system developed by
Apple Inc., being the successor to iOS 8. It was announced at the company's
Worldwide Developers Conference on June 8, 2015, and was released on
September 16, 2015. It was succeeded by iOS 10 on September 13, 2016. iOS 9
...

iOS is a mobile operating system, developed by Apple Inc. for iPhone, iPad, and
iPod Touch. Updates for iOS are released through the iTunes software, and,
since iOS 5, via over-the-air software updates. With the announcement of iOS 5.0
on June 6, 2011, a USB connection to iTunes was no longer needed to activate
iOS ...

The iOS kernel is the XNU kernel of Darwin. The original iPhone OS (1.0) up to
iPhone OS 3.1.3 used Darwin 9.0.0d1. iOS 4 was based on Darwin 10. iOS 5 was
based on Darwin 11. iOS 6 was based on Darwin 13. iOS 7 and iOS 8 are based
on Darwin 14. iOS 9 is based on Darwin 15. iOS 10 is based on ...

Also added ability to sync and read books with iPhone or iPod touch with iOS 4
and iBooks 1.1. Added ability to organize and sync PDF documents as books,
and to read PDFs with iBooks 1.1 on iPad and any iPhone or iPod touch with iOS
4. Added option to organize your apps on iOS 4 home ...

iOS jailbreaking is privilege escalation for the process of removing software
restrictions imposed by Apple on iOS and tvOS. It typically does this by using a
series of kernel patches. Jailbreaking permits root access to iOS, allowing the
downloading and installation of additional applications, extensions, and themes
that are ...